Add PCIe legacy interrupt INTx support to the iProc PCIe driver by
modeling it with its own IRQ domain. All 4 interrupts INTA, INTB, INTC,
INTD share the same interrupt line connected to the GIC in the system,
while the status of each INTx can be obtained through the INTX CSR
register

Are these level or edge interrupts ? although I see DT says: IRQ_TYPE_NONE

DT entries should be fixed to trigger on level HIGH like Florian and I
discussed on the mailing list yesterday. It looks like you are missing a
lot of discussions on the mailing list. Could you please help to make
sure you read all the existing discussions when commenting on a patch?

do you not need to clear interrupt status bits in IPROC_PCIE_INTX_CSR ?